Remote controlled receiving apparatus which prevents erroneous operation due to noise

ABSTRACT

A remote controlled receiving apparatus for remotely controlling channel selection, on-off switching of a power source, volume adjustment or the like for television receiver sets and providing an improvement of the same which is free from erroneous operation due to noises such as telephone ring, banging of a door and the like.

United States Patent Saito et al. Oct. 7, 1975 1 1 REMOTE CONTROLLED RECEIVING [51] Int. CL I-I04B 1/10 APPARATUS WHICH PREVENTS [58] Field of Search 325/390-393, ERRONEOUS OPERATION DUE TO NOISE 325/476, 8; l78/DIG. 15; 343/ 8; 340/15, 171 R;317/147 [75] Inventors: H1r0sh1 Santo; Kumto Mlyamoto,

both of Katano, Japan [56] References Cited [73] Assignee: Matsushita Electric Industrial Co., UNITED STATES PATENTS Ltd., Osaka, Japan 2,930,890 3/1960 Lenk 325/478 [22] Filed: May 31, 1973 2,959,716 11/1960 Gordon, .lr.. 317/147 3,168,738 2/1965 Curll 325/390 [21] Appl. NO.. 365,731 3,750,033 7/1973 Fukata 325/478 [30] Foreign Application Priority Data Primary Examiner-George H. Libman June 2, 1972 Japan 47-552781U] Attorney, Agent, Firmstevens, Davis, Miller & June 2, 1972 Japan.... 47-655l1lU] Moshe June 2, 1972 Japan.... 47-65512[U] June 2, 1972 Japan... 47-655131U] [57] ABSTRACT June Japan 4765514[U] A remote controlled receiving apparatus for remotely June [972 47'65515w] controlling channel selection, on-off switching of a .IUl'lC 2, Japan power Source, volume adjustment or the for tele June 1972 Japan 47'72896[U] vision receiver sets and providing an improvement of June 1972 Japan 47'72897w] the same which is free from erroneous operation due June 19, 1972 Japan 47-72898[U] to noises such as telephone ring banging of a door and the like. [52] U.S. Cl. 325/392; l78/DIG. 15; 325/478;

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1. A remote controllable receiving apparatus comprising a receiver unit for receiving an incident signal wave, a plurality of frequency selection circuits which are respectively tunable to a plurality of different control frequency components contained in the received signal wave For control of the apparatus, a plurality of detector circuits for detecting first output signals supplied from said frequency selection circuits respectively, said detector circuits having respective output terminals for providing second output signals corresponding to said first output signals, a plurality of switching circuits, each including a first transistor, for turning on in response to said second output signals of said detector circuits above definite levels thereof respectively, a plurality of controllable devices which are on-off controlled by the respective switching circuits, an inhibit circuit for detecting AC noise components included in the second output signals of said detector circuits to turn off said switching circuits, and first capacitor means, connected between ground and the base of said first transistor and between ground and said output terminals of said detector circuits, for retarding the turn-on of said switching circuits to avoid the turn-on of said switching circuits due to the AC noise components and to allow the turn-on of said switching circuits due only to the control frequency components, said first capacitor means being connected to said inhibit circuit to discharge through said inhibit circuit when the AC noise components are detected.
 2. An apparatus as claimed in claim 1 wherein said receiver unit comprises a microphone and an amplifier.
 3. An apparatus as claimed in claim 1 wherein said controllable devices comprise relay means.
 4. An apparatus as claimed in claim 1 wherein said inhibit circuit comprises second capacitor means connected to the output terminals of said detector circuits for taking out the AC noise components of the second output signals of said detector circuits, amplifier means for amplifying the AC components taken-out, and a single second transistor whose emitter and collector are connected between said output terminals and ground, said second transistor being on-off controlled by said amplifier means.
 5. A remote controllable receiving apparatus according to claim 1 wherein said inhibit circuit comprises second capacitor means connected to the output terminals of said detector circuits for deriving the AC noise components contained in the second output signals of said detector circuits, means for amplifying the derived AC components, and relay means, connected to said amplifying means, for grounding output signals of said first capacitor means to turn off said controllable devices by said switching circuits. 